House Energy And Commerce Committee

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House Energy and Commerce Committee Chairman Fred Upton, Michigan Republican, said that it would be best to wait for the resolution of legal challenges to the EPA's Clean Power Act before implementing the plan. (Associated Press)

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** FILE ** Rep. Fred Upton, House Energy and Commerce Committee chairman. (Associated Press)

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** FILE ** Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington, Wednesday, Oct. 30, 2013, before the House Energy and Commerce Committee hearing on the difficulties plaguing the implementation of the Affordable Care Act. (AP Photo/J. Scott Applewhite, File)

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A screen shows the HealthCare.gov website being down during a House Energy and Commerce Committee hearing on Capitol Hill in Washington, Wednesday, Oct. 30, 2013, with Health and Human Services Secretary Kathleen Sebelius. (AP Photo/ Evan Vucci)

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Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington, Wednesday, Oct. 30, 2013, before the House Energy and Commerce Committee hearing on the difficulties plaguing the implementation of the Affordable Care Act. (AP Photo/ Evan Vucci)

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** FILE ** Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington, Wednesday, Oct. 30, 2013, before the House Energy and Commerce Committee hearing on the difficulties plaguing the implementation of the Affordable Care Act. (AP Photo/ Evan Vucci)

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** FILE ** Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington, Wednesday, Oct. 30, 2013, before the House Energy and Commerce Committee hearing on the difficulties plaguing the implementation of the Affordable Care Act. (AP Photo/Evan Vucci)

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** FILE ** Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington, Wednesday, Oct. 30, 2013, before the House Energy and Commerce Committee hearing on the difficulties plaguing the implementation of the Affordable Care Act. (AP Photo/ Evan Vucci)